1. P. T. Brady, “A technique for investigating on-off patterns of speech,” Bell Syst. Tech. /., vol. 44, pp. 1–22,1965.
2. Y. Yatsuzuka, “Highly sensitive speech detector and high-speed voiceband data discriminator in DSI-ADPCM systems,” IEEE Trans Commun, vol. 30, pp. 739–750, April 1982.
3. S. Hatamian, “Enhanced speech activity detection for mobile telephony,” Proc. IEEE Vehicular Technology Society Conf., vol. 1, pp. 159–162, Denver, May 1992.
4. D.K. Freeman, G. Cosier, C.B. Southcott, and I. Boyd, “The voice activity detector for the Pan-European digital celluar mobile telephone servcie,” Proc. Int’l. Conf. Acoust. Speech, Sig. Proc., vol. 1, pp. 369–372, Glasgow, May 1989.
5. Qualcomm, Inc., “Proposed EIA/TIA Interim Standard - Wideband Spread Spectrum Digital Cellular System Dual-Mode Mobile Station-Base Station Compatibility Standard,” Submitted to the TIA TR45.5 Subcommittee., April 21, 1992.